Not happy with the stock horn on my '16 Thruxton. Installed Hella B133 twin horns on frame down tubes with the below pictured 1 1/4" brackets. The horns came with a relay and I bought a fused lead and ran direct from battery. Removed old horn and mounted relay there. Right side mounted easily but left side required some thinning of the bracket to slide past fan shroud. No wiring was harmed in the process. Cost about $55 (not including the extra relay I had to buy after buggering up the first one). Happy with the result.
Mate what have you done? I’m pleased you are pleased, but I’m sorry I personally think they look completely out of place on such an iconic machine